Amulet of Teaching
The Amulet of Teaching is a C3/DS tool that will teach any norns that are standing in front of it when it is pushed. It's activatable by both norns and the hands, so it makes teaching much easier. It is both C3 and DS compatible. Very useful for those with several metarooms.
Helen did the coding for the Amulet of Teaching and Random did the sprites. It could be downloaded from Helen's Bibble Directory and KnyteTrypper's C3/DS Nexus, but is currently available at CreaturesFrance.